Bradford White Water Heater M4XRTW50T6FSX

Position power switch on gas control to the “OFF” position.

Remove the three screws from control access cover on blower assembly and remove cover.

Carefully remove pressure switch from blower housing.

Disconnect wire leads from pressure switch.

Use a multi-meter set to the ohms setting and check across pressure switch terminals with blower off.

Are switch contacts open? (no electrical continuity)

Position gas valve power switch to the “ON” position and adjust thermostat to call for heat.

Verify 120VAC and proper polarity at wall outlet.

With unit plugged in and control power switch in the “ON” position, verify LED status.

Using a volt meter set to volts AC, is there 120VAC across terminals shown in photo 29?

Is there 120VAC across terminals shown in photo 30?

Is there 120VAC across black & white wires as shown in photo 32?

Check for 120VAC between black & white wires.

Verify error code as listed on page 13.

Remove three screws from control access cover on blower and remove cover

Is there 10 to 13 VAC between red wire leading to blower temperature switch and green ground wire?

Is LED on gas valve flashing the “heartbeat” code (alternating bright/dim)?

Is there 10 to 13 VAC between yellow wire leading from pressure switch and green ground wire?

Is there continuity through blower temperature switch?

Check for loose or broken wire connection at switch terminals

Position gas control power switch to the “OFF” position and unplug heater from wall outlet.

Turn off gas supply to water heater.

Remove outer jacket door and slide inner door open from left to right.

Disconnect pilot tube using a 7/16 wrench and feedline using a ¾ wrench from gas control.

Disconnect igniter/flame sensor wire from gas control.

Remove burner assembly from combustion chamber.

Inspect burner surface area and burner port area and remove any loose debris.

Inspect cast iron burners for any debris build up inside burner casting.

Position gas control power switch to 'ON' position and adjust control to call for heat.

Remove the three screws from control access cover on blower assembly and remove cover.

Does blower energize within 2 minutes?

If blower does not energize within 2 minutes, does it run for 30 seconds and shut down?

Is there 115 VAC at wall outlet?

Repair or replace power cord if damaged.